817561081683 has 12 divisors (see below), whose sum is σ = 1181365052400. Its totient is φ = 544836033456.

The previous prime is 817561081679. The next prime is 817561081697. The reversal of 817561081683 is 386180165718.

817561081683 is a `hidden beast` number, since 8 + 1 + 7 + 5 + 610 + 8 + 16 + 8 + 3 = 666.

It is not a de Polignac number, because 817561081683 - 2² = 817561081679 is a prime.

It is a super-2 number, since 2×817561081683² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (817561088683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17032008 + ... + 17079941.

It is an arithmetic number, because the mean of its divisors is an integer number (98447087700).

Almost surely, 2^817561081683 is an apocalyptic number.

817561081683 is a deficient number, since it is larger than the sum of its proper divisors (363803970717).

817561081683 is a wasteful number, since it uses less digits than its factorization.

817561081683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34114618 (or 34114615 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 817561081683 in words is "eight hundred seventeen billion, five hundred sixty-one million, eighty-one thousand, six hundred eighty-three".